Updated openstack/openstack
Project: openstack/tempest  eef838171eefe031b9c82d81a2116473e7b31fcf

Switch to using subunit-trace from tempest-lib

This commit removes the tempest copy of subunit-trace and uses the
entry-point from tempest-lib instead.

Partially implements bp tempest-library

Change-Id: Ic1aeddc2d0b217c41b6b9914ac3f269b80c4ec8e